import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        int n = in.nextInt();
        StringBuilder str = new StringBuilder();
        int left = 1,right = n;
        while (left < right){
            str.append(left + " ");
            left++;
            if(left < right){
                str.append(right + " ");
                right--;
            }
        }
        str.append(left);
        System.out.println(str);
    }
}